How does the scaling work in an open world Pokemon game? Ya'll realize how highly level dependent Pokemon games are right? I'm not even sure how an open world Pokemon game would work to ensure that the game always remained fair to the player. Being a turn-based game where the game naturally scales as you progress, going open world sounds like a mess of problems.
DO it like many other RPGs - have level dependent areas. So areas near the beginning are lower level and other areas, which could still be blocked by various means if they wish to gate progress, are higher.
Anyone who hasn't might want to look at World of Warcraft's Pet Battle system. That has critters in the world, who's level depends on the zone they're in (higher level zones have higher level critters), and walking up to them and clicking triggers a turn based battle very similar to Pokemon. That's just a minigame in an MMO. There is absolutely no reason this couldn't work in a Pokemon RPG. It even has "trainers" who you can fight, who have their own teams, with typings and weaknesses which need to be prepared for. It allows you to catch and level creatures, battle NPCs and other players and you can even "trade" the pets by putting them in "cages" and swapping them with other players or selling them on the auction house. It has type based creatures and moves, status effects, and rare, named pets which are very hard to catch and have random spawn locations / times. All this is done by seamlessly swapping from a real time, 3D open world into a turn based battle and then popping you out in the same location at the end, with no loading screens.
Seriously, WoW's pet battles are like a pokemon game in their own right now. If Blizzard can do it in a simple minigame as part of a ~13 year old game then to suggest that "it couldn't work" if developed by the Game Freak, with all the finance they would have available to them, is totally laughable. People need to stop giving them excuses - they're insanely conservative and the games COULD be so much more IF THEY WANTED THEM TO BE. Saying that there's literally no way a Pokemon RPG could work in a 3D open world is utterly asinine because many of the core elements have already been done in fricking World of Warcraft.